1//===--- IdentifierTable.cpp - Hash table for identifier lookup -----------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file implements the IdentifierInfo, IdentifierVisitor, and
11// IdentifierTable interfaces.
12//
13//===----------------------------------------------------------------------===//
14
15#include "clang/Basic/CharInfo.h"
16#include "clang/Basic/IdentifierTable.h"
17#include "clang/Basic/LangOptions.h"
18#include "clang/Basic/OperatorKinds.h"
19#include "llvm/ADT/DenseMap.h"
20#include "llvm/ADT/FoldingSet.h"
21#include "llvm/ADT/SmallString.h"
22#include "llvm/Support/ErrorHandling.h"
23#include "llvm/Support/raw_ostream.h"
24#include <cstdio>
25
26using namespace clang;
27
28//===----------------------------------------------------------------------===//
29// IdentifierInfo Implementation
30//===----------------------------------------------------------------------===//
31
32IdentifierInfo::IdentifierInfo() {
33  TokenID = tok::identifier;
34  ObjCOrBuiltinID = 0;
35  HasMacro = false;
36  HadMacro = false;
37  IsExtension = false;
38  IsCXX11CompatKeyword = false;
39  IsPoisoned = false;
40  IsCPPOperatorKeyword = false;
41  NeedsHandleIdentifier = false;
42  IsFromAST = false;
43  ChangedAfterLoad = false;
44  RevertedTokenID = false;
45  OutOfDate = false;
46  IsModulesImport = false;
47  FETokenInfo = nullptr;
48  Entry = nullptr;
49}
50
51//===----------------------------------------------------------------------===//
52// IdentifierTable Implementation
53//===----------------------------------------------------------------------===//
54
55IdentifierIterator::~IdentifierIterator() { }
56
57IdentifierInfoLookup::~IdentifierInfoLookup() {}
58
59namespace {
60  /// \brief A simple identifier lookup iterator that represents an
61  /// empty sequence of identifiers.
62  class EmptyLookupIterator : public IdentifierIterator
63  {
64  public:
65    StringRef Next() override { return StringRef(); }
66  };
67}
68
69IdentifierIterator *IdentifierInfoLookup::getIdentifiers() {
70  return new EmptyLookupIterator();
71}
72
73ExternalIdentifierLookup::~ExternalIdentifierLookup() {}
74
75IdentifierTable::IdentifierTable(const LangOptions &LangOpts,
76                                 IdentifierInfoLookup* externalLookup)
77  : HashTable(8192), // Start with space for 8K identifiers.
78    ExternalLookup(externalLookup) {
79
80  // Populate the identifier table with info about keywords for the current
81  // language.
82  AddKeywords(LangOpts);
83
84
85  // Add the '_experimental_modules_import' contextual keyword.
86  get("import").setModulesImport(true);
87}
88
89//===----------------------------------------------------------------------===//
90// Language Keyword Implementation
91//===----------------------------------------------------------------------===//
92
93// Constants for TokenKinds.def
94namespace {
95  enum {
96    KEYC99 = 0x1,
97    KEYCXX = 0x2,
98    KEYCXX11 = 0x4,
99    KEYGNU = 0x8,
100    KEYMS = 0x10,
101    BOOLSUPPORT = 0x20,
102    KEYALTIVEC = 0x40,
103    KEYNOCXX = 0x80,
104    KEYBORLAND = 0x100,
105    KEYOPENCL = 0x200,
106    KEYC11 = 0x400,
107    KEYARC = 0x800,
108    KEYNOMS18 = 0x01000,
109    KEYNOOPENCL = 0x02000,
110    WCHARSUPPORT = 0x04000,
111    HALFSUPPORT = 0x08000,
112    KEYALL = (0xffff & ~KEYNOMS18 &
113              ~KEYNOOPENCL) // KEYNOMS18 and KEYNOOPENCL are used to exclude.
114  };
115
116  /// \brief How a keyword is treated in the selected standard.
117  enum KeywordStatus {
118    KS_Disabled,    // Disabled
119    KS_Extension,   // Is an extension
120    KS_Enabled,     // Enabled
121    KS_Future       // Is a keyword in future standard
122  };
123}
124
125/// \brief Translates flags as specified in TokenKinds.def into keyword status
126/// in the given language standard.
127static KeywordStatus getKeywordStatus(const LangOptions &LangOpts,
128                                      unsigned Flags) {
129  if (Flags == KEYALL) return KS_Enabled;
130  if (LangOpts.CPlusPlus && (Flags & KEYCXX)) return KS_Enabled;
131  if (LangOpts.CPlusPlus11 && (Flags & KEYCXX11)) return KS_Enabled;
132  if (LangOpts.C99 && (Flags & KEYC99)) return KS_Enabled;
133  if (LangOpts.GNUKeywords && (Flags & KEYGNU)) return KS_Extension;
134  if (LangOpts.MicrosoftExt && (Flags & KEYMS)) return KS_Extension;
135  if (LangOpts.Borland && (Flags & KEYBORLAND)) return KS_Extension;
136  if (LangOpts.Bool && (Flags & BOOLSUPPORT)) return KS_Enabled;
137  if (LangOpts.Half && (Flags & HALFSUPPORT)) return KS_Enabled;
138  if (LangOpts.WChar && (Flags & WCHARSUPPORT)) return KS_Enabled;
139  if (LangOpts.AltiVec && (Flags & KEYALTIVEC)) return KS_Enabled;
140  if (LangOpts.OpenCL && (Flags & KEYOPENCL)) return KS_Enabled;
141  if (!LangOpts.CPlusPlus && (Flags & KEYNOCXX)) return KS_Enabled;
142  if (LangOpts.C11 && (Flags & KEYC11)) return KS_Enabled;
143  // We treat bridge casts as objective-C keywords so we can warn on them
144  // in non-arc mode.
145  if (LangOpts.ObjC2 && (Flags & KEYARC)) return KS_Enabled;
146  if (LangOpts.CPlusPlus && (Flags & KEYCXX11)) return KS_Future;
147  return KS_Disabled;
148}
149
150/// AddKeyword - This method is used to associate a token ID with specific
151/// identifiers because they are language keywords.  This causes the lexer to
152/// automatically map matching identifiers to specialized token codes.
153static void AddKeyword(StringRef Keyword,
154                       tok::TokenKind TokenCode, unsigned Flags,
155                       const LangOptions &LangOpts, IdentifierTable &Table) {
156  KeywordStatus AddResult = getKeywordStatus(LangOpts, Flags);
157
158  // Don't add this keyword under MSVCCompat.
159  if (LangOpts.MSVCCompat && (Flags & KEYNOMS18) &&
160      !LangOpts.isCompatibleWithMSVC(19))
161    return;
162
163  // Don't add this keyword under OpenCL.
164  if (LangOpts.OpenCL && (Flags & KEYNOOPENCL))
165    return;
166
167  // Don't add this keyword if disabled in this language.
168  if (AddResult == KS_Disabled) return;
169
170  IdentifierInfo &Info =
171      Table.get(Keyword, AddResult == KS_Future ? tok::identifier : TokenCode);
172  Info.setIsExtensionToken(AddResult == KS_Extension);
173  Info.setIsCXX11CompatKeyword(AddResult == KS_Future);
174}
175
176/// AddCXXOperatorKeyword - Register a C++ operator keyword alternative
177/// representations.
178static void AddCXXOperatorKeyword(StringRef Keyword,
179                                  tok::TokenKind TokenCode,
180                                  IdentifierTable &Table) {
181  IdentifierInfo &Info = Table.get(Keyword, TokenCode);
182  Info.setIsCPlusPlusOperatorKeyword();
183}
184
185/// AddObjCKeyword - Register an Objective-C \@keyword like "class" "selector"
186/// or "property".
187static void AddObjCKeyword(StringRef Name,
188                           tok::ObjCKeywordKind ObjCID,
189                           IdentifierTable &Table) {
190  Table.get(Name).setObjCKeywordID(ObjCID);
191}
192
193/// AddKeywords - Add all keywords to the symbol table.
194///
195void IdentifierTable::AddKeywords(const LangOptions &LangOpts) {
196  // Add keywords and tokens for the current language.
197#define KEYWORD(NAME, FLAGS) \
198  AddKeyword(StringRef(#NAME), tok::kw_ ## NAME,  \
199             FLAGS, LangOpts, *this);
200#define ALIAS(NAME, TOK, FLAGS) \
201  AddKeyword(StringRef(NAME), tok::kw_ ## TOK,  \
202             FLAGS, LangOpts, *this);
203#define CXX_KEYWORD_OPERATOR(NAME, ALIAS) \
204  if (LangOpts.CXXOperatorNames)          \
205    AddCXXOperatorKeyword(StringRef(#NAME), tok::ALIAS, *this);
206#define OBJC1_AT_KEYWORD(NAME) \
207  if (LangOpts.ObjC1)          \
208    AddObjCKeyword(StringRef(#NAME), tok::objc_##NAME, *this);
209#define OBJC2_AT_KEYWORD(NAME) \
210  if (LangOpts.ObjC2)          \
211    AddObjCKeyword(StringRef(#NAME), tok::objc_##NAME, *this);
212#define TESTING_KEYWORD(NAME, FLAGS)
213#include "clang/Basic/TokenKinds.def"
214
215  if (LangOpts.ParseUnknownAnytype)
216    AddKeyword("__unknown_anytype", tok::kw___unknown_anytype, KEYALL,
217               LangOpts, *this);
218}
219
220/// \brief Checks if the specified token kind represents a keyword in the
221/// specified language.
222/// \returns Status of the keyword in the language.
223static KeywordStatus getTokenKwStatus(const LangOptions &LangOpts,
224                                      tok::TokenKind K) {
225  switch (K) {
226#define KEYWORD(NAME, FLAGS) \
227  case tok::kw_##NAME: return getKeywordStatus(LangOpts, FLAGS);
228#include "clang/Basic/TokenKinds.def"
229  default: return KS_Disabled;
230  }
231}
232
233/// \brief Returns true if the identifier represents a keyword in the
234/// specified language.
235bool IdentifierInfo::isKeyword(const LangOptions &LangOpts) {
236  switch (getTokenKwStatus(LangOpts, getTokenID())) {
237  case KS_Enabled:
238  case KS_Extension:
239    return true;
240  default:
241    return false;
242  }
243}
244
245tok::PPKeywordKind IdentifierInfo::getPPKeywordID() const {
246  // We use a perfect hash function here involving the length of the keyword,
247  // the first and third character.  For preprocessor ID's there are no
248  // collisions (if there were, the switch below would complain about duplicate
249  // case values).  Note that this depends on 'if' being null terminated.
250
251#define HASH(LEN, FIRST, THIRD) \
252  (LEN << 5) + (((FIRST-'a') + (THIRD-'a')) & 31)
253#define CASE(LEN, FIRST, THIRD, NAME) \
254  case HASH(LEN, FIRST, THIRD): \
255    return memcmp(Name, #NAME, LEN) ? tok::pp_not_keyword : tok::pp_ ## NAME
256
257  unsigned Len = getLength();
258  if (Len < 2) return tok::pp_not_keyword;
259  const char *Name = getNameStart();
260  switch (HASH(Len, Name[0], Name[2])) {
261  default: return tok::pp_not_keyword;
262  CASE( 2, 'i', '\0', if);
263  CASE( 4, 'e', 'i', elif);
264  CASE( 4, 'e', 's', else);
265  CASE( 4, 'l', 'n', line);
266  CASE( 4, 's', 'c', sccs);
267  CASE( 5, 'e', 'd', endif);
268  CASE( 5, 'e', 'r', error);
269  CASE( 5, 'i', 'e', ident);
270  CASE( 5, 'i', 'd', ifdef);
271  CASE( 5, 'u', 'd', undef);
272
273  CASE( 6, 'a', 's', assert);
274  CASE( 6, 'd', 'f', define);
275  CASE( 6, 'i', 'n', ifndef);
276  CASE( 6, 'i', 'p', import);
277  CASE( 6, 'p', 'a', pragma);
278
279  CASE( 7, 'd', 'f', defined);
280  CASE( 7, 'i', 'c', include);
281  CASE( 7, 'w', 'r', warning);
282
283  CASE( 8, 'u', 'a', unassert);
284  CASE(12, 'i', 'c', include_next);
285
286  CASE(14, '_', 'p', __public_macro);
287
288  CASE(15, '_', 'p', __private_macro);
289
290  CASE(16, '_', 'i', __include_macros);
291#undef CASE
292#undef HASH
293  }
294}
295
296//===----------------------------------------------------------------------===//
297// Stats Implementation
298//===----------------------------------------------------------------------===//
299
300/// PrintStats - Print statistics about how well the identifier table is doing
301/// at hashing identifiers.
302void IdentifierTable::PrintStats() const {
303  unsigned NumBuckets = HashTable.getNumBuckets();
304  unsigned NumIdentifiers = HashTable.getNumItems();
305  unsigned NumEmptyBuckets = NumBuckets-NumIdentifiers;
306  unsigned AverageIdentifierSize = 0;
307  unsigned MaxIdentifierLength = 0;
308
309  // TODO: Figure out maximum times an identifier had to probe for -stats.
310  for (llvm::StringMap<IdentifierInfo*, llvm::BumpPtrAllocator>::const_iterator
311       I = HashTable.begin(), E = HashTable.end(); I != E; ++I) {
312    unsigned IdLen = I->getKeyLength();
313    AverageIdentifierSize += IdLen;
314    if (MaxIdentifierLength < IdLen)
315      MaxIdentifierLength = IdLen;
316  }
317
318  fprintf(stderr, "\n*** Identifier Table Stats:\n");
319  fprintf(stderr, "# Identifiers:   %d\n", NumIdentifiers);
320  fprintf(stderr, "# Empty Buckets: %d\n", NumEmptyBuckets);
321  fprintf(stderr, "Hash density (#identifiers per bucket): %f\n",
322          NumIdentifiers/(double)NumBuckets);
323  fprintf(stderr, "Ave identifier length: %f\n",
324          (AverageIdentifierSize/(double)NumIdentifiers));
325  fprintf(stderr, "Max identifier length: %d\n", MaxIdentifierLength);
326
327  // Compute statistics about the memory allocated for identifiers.
328  HashTable.getAllocator().PrintStats();
329}
330
331//===----------------------------------------------------------------------===//
332// SelectorTable Implementation
333//===----------------------------------------------------------------------===//
334
335unsigned llvm::DenseMapInfo<clang::Selector>::getHashValue(clang::Selector S) {
336  return DenseMapInfo<void*>::getHashValue(S.getAsOpaquePtr());
337}
338
339namespace clang {
340/// MultiKeywordSelector - One of these variable length records is kept for each
341/// selector containing more than one keyword. We use a folding set
342/// to unique aggregate names (keyword selectors in ObjC parlance). Access to
343/// this class is provided strictly through Selector.
344class MultiKeywordSelector
345  : public DeclarationNameExtra, public llvm::FoldingSetNode {
346  MultiKeywordSelector(unsigned nKeys) {
347    ExtraKindOrNumArgs = NUM_EXTRA_KINDS + nKeys;
348  }
349public:
350  // Constructor for keyword selectors.
351  MultiKeywordSelector(unsigned nKeys, IdentifierInfo **IIV) {
352    assert((nKeys > 1) && "not a multi-keyword selector");
353    ExtraKindOrNumArgs = NUM_EXTRA_KINDS + nKeys;
354
355    // Fill in the trailing keyword array.
356    IdentifierInfo **KeyInfo = reinterpret_cast<IdentifierInfo **>(this+1);
357    for (unsigned i = 0; i != nKeys; ++i)
358      KeyInfo[i] = IIV[i];
359  }
360
361  // getName - Derive the full selector name and return it.
362  std::string getName() const;
363
364  unsigned getNumArgs() const { return ExtraKindOrNumArgs - NUM_EXTRA_KINDS; }
365
366  typedef IdentifierInfo *const *keyword_iterator;
367  keyword_iterator keyword_begin() const {
368    return reinterpret_cast<keyword_iterator>(this+1);
369  }
370  keyword_iterator keyword_end() const {
371    return keyword_begin()+getNumArgs();
372  }
373  IdentifierInfo *getIdentifierInfoForSlot(unsigned i) const {
374    assert(i < getNumArgs() && "getIdentifierInfoForSlot(): illegal index");
375    return keyword_begin()[i];
376  }
377  static void Profile(llvm::FoldingSetNodeID &ID,
378                      keyword_iterator ArgTys, unsigned NumArgs) {
379    ID.AddInteger(NumArgs);
380    for (unsigned i = 0; i != NumArgs; ++i)
381      ID.AddPointer(ArgTys[i]);
382  }
383  void Profile(llvm::FoldingSetNodeID &ID) {
384    Profile(ID, keyword_begin(), getNumArgs());
385  }
386};
387} // end namespace clang.
388
389unsigned Selector::getNumArgs() const {
390  unsigned IIF = getIdentifierInfoFlag();
391  if (IIF <= ZeroArg)
392    return 0;
393  if (IIF == OneArg)
394    return 1;
395  // We point to a MultiKeywordSelector.
396  MultiKeywordSelector *SI = getMultiKeywordSelector();
397  return SI->getNumArgs();
398}
399
400IdentifierInfo *Selector::getIdentifierInfoForSlot(unsigned argIndex) const {
401  if (getIdentifierInfoFlag() < MultiArg) {
402    assert(argIndex == 0 && "illegal keyword index");
403    return getAsIdentifierInfo();
404  }
405  // We point to a MultiKeywordSelector.
406  MultiKeywordSelector *SI = getMultiKeywordSelector();
407  return SI->getIdentifierInfoForSlot(argIndex);
408}
409
410StringRef Selector::getNameForSlot(unsigned int argIndex) const {
411  IdentifierInfo *II = getIdentifierInfoForSlot(argIndex);
412  return II? II->getName() : StringRef();
413}
414
415std::string MultiKeywordSelector::getName() const {
416  SmallString<256> Str;
417  llvm::raw_svector_ostream OS(Str);
418  for (keyword_iterator I = keyword_begin(), E = keyword_end(); I != E; ++I) {
419    if (*I)
420      OS << (*I)->getName();
421    OS << ':';
422  }
423
424  return OS.str();
425}
426
427std::string Selector::getAsString() const {
428  if (InfoPtr == 0)
429    return "<null selector>";
430
431  if (getIdentifierInfoFlag() < MultiArg) {
432    IdentifierInfo *II = getAsIdentifierInfo();
433
434    // If the number of arguments is 0 then II is guaranteed to not be null.
435    if (getNumArgs() == 0)
436      return II->getName();
437
438    if (!II)
439      return ":";
440
441    return II->getName().str() + ":";
442  }
443
444  // We have a multiple keyword selector.
445  return getMultiKeywordSelector()->getName();
446}
447
448void Selector::print(llvm::raw_ostream &OS) const {
449  OS << getAsString();
450}
451
452/// Interpreting the given string using the normal CamelCase
453/// conventions, determine whether the given string starts with the
454/// given "word", which is assumed to end in a lowercase letter.
455static bool startsWithWord(StringRef name, StringRef word) {
456  if (name.size() < word.size()) return false;
457  return ((name.size() == word.size() || !isLowercase(name[word.size()])) &&
458          name.startswith(word));
459}
460
461ObjCMethodFamily Selector::getMethodFamilyImpl(Selector sel) {
462  IdentifierInfo *first = sel.getIdentifierInfoForSlot(0);
463  if (!first) return OMF_None;
464
465  StringRef name = first->getName();
466  if (sel.isUnarySelector()) {
467    if (name == "autorelease") return OMF_autorelease;
468    if (name == "dealloc") return OMF_dealloc;
469    if (name == "finalize") return OMF_finalize;
470    if (name == "release") return OMF_release;
471    if (name == "retain") return OMF_retain;
472    if (name == "retainCount") return OMF_retainCount;
473    if (name == "self") return OMF_self;
474    if (name == "initialize") return OMF_initialize;
475  }
476
477  if (name == "performSelector") return OMF_performSelector;
478
479  // The other method families may begin with a prefix of underscores.
480  while (!name.empty() && name.front() == '_')
481    name = name.substr(1);
482
483  if (name.empty()) return OMF_None;
484  switch (name.front()) {
485  case 'a':
486    if (startsWithWord(name, "alloc")) return OMF_alloc;
487    break;
488  case 'c':
489    if (startsWithWord(name, "copy")) return OMF_copy;
490    break;
491  case 'i':
492    if (startsWithWord(name, "init")) return OMF_init;
493    break;
494  case 'm':
495    if (startsWithWord(name, "mutableCopy")) return OMF_mutableCopy;
496    break;
497  case 'n':
498    if (startsWithWord(name, "new")) return OMF_new;
499    break;
500  default:
501    break;
502  }
503
504  return OMF_None;
505}
506
507ObjCInstanceTypeFamily Selector::getInstTypeMethodFamily(Selector sel) {
508  IdentifierInfo *first = sel.getIdentifierInfoForSlot(0);
509  if (!first) return OIT_None;
510
511  StringRef name = first->getName();
512
513  if (name.empty()) return OIT_None;
514  switch (name.front()) {
515    case 'a':
516      if (startsWithWord(name, "array")) return OIT_Array;
517      break;
518    case 'd':
519      if (startsWithWord(name, "default")) return OIT_ReturnsSelf;
520      if (startsWithWord(name, "dictionary")) return OIT_Dictionary;
521      break;
522    case 's':
523      if (startsWithWord(name, "shared")) return OIT_ReturnsSelf;
524      if (startsWithWord(name, "standard")) return OIT_Singleton;
525    case 'i':
526      if (startsWithWord(name, "init")) return OIT_Init;
527    default:
528      break;
529  }
530  return OIT_None;
531}
532
533ObjCStringFormatFamily Selector::getStringFormatFamilyImpl(Selector sel) {
534  IdentifierInfo *first = sel.getIdentifierInfoForSlot(0);
535  if (!first) return SFF_None;
536
537  StringRef name = first->getName();
538
539  switch (name.front()) {
540    case 'a':
541      if (name == "appendFormat") return SFF_NSString;
542      break;
543
544    case 'i':
545      if (name == "initWithFormat") return SFF_NSString;
546      break;
547
548    case 'l':
549      if (name == "localizedStringWithFormat") return SFF_NSString;
550      break;
551
552    case 's':
553      if (name == "stringByAppendingFormat" ||
554          name == "stringWithFormat") return SFF_NSString;
555      break;
556  }
557  return SFF_None;
558}
559
560namespace {
561  struct SelectorTableImpl {
562    llvm::FoldingSet<MultiKeywordSelector> Table;
563    llvm::BumpPtrAllocator Allocator;
564  };
565} // end anonymous namespace.
566
567static SelectorTableImpl &getSelectorTableImpl(void *P) {
568  return *static_cast<SelectorTableImpl*>(P);
569}
570
571SmallString<64>
572SelectorTable::constructSetterName(StringRef Name) {
573  SmallString<64> SetterName("set");
574  SetterName += Name;
575  SetterName[3] = toUppercase(SetterName[3]);
576  return SetterName;
577}
578
579Selector
580SelectorTable::constructSetterSelector(IdentifierTable &Idents,
581                                       SelectorTable &SelTable,
582                                       const IdentifierInfo *Name) {
583  IdentifierInfo *SetterName =
584    &Idents.get(constructSetterName(Name->getName()));
585  return SelTable.getUnarySelector(SetterName);
586}
587
588size_t SelectorTable::getTotalMemory() const {
589  SelectorTableImpl &SelTabImpl = getSelectorTableImpl(Impl);
590  return SelTabImpl.Allocator.getTotalMemory();
591}
592
593Selector SelectorTable::getSelector(unsigned nKeys, IdentifierInfo **IIV) {
594  if (nKeys < 2)
595    return Selector(IIV[0], nKeys);
596
597  SelectorTableImpl &SelTabImpl = getSelectorTableImpl(Impl);
598
599  // Unique selector, to guarantee there is one per name.
600  llvm::FoldingSetNodeID ID;
601  MultiKeywordSelector::Profile(ID, IIV, nKeys);
602
603  void *InsertPos = nullptr;
604  if (MultiKeywordSelector *SI =
605        SelTabImpl.Table.FindNodeOrInsertPos(ID, InsertPos))
606    return Selector(SI);
607
608  // MultiKeywordSelector objects are not allocated with new because they have a
609  // variable size array (for parameter types) at the end of them.
610  unsigned Size = sizeof(MultiKeywordSelector) + nKeys*sizeof(IdentifierInfo *);
611  MultiKeywordSelector *SI =
612    (MultiKeywordSelector*)SelTabImpl.Allocator.Allocate(Size,
613                                         llvm::alignOf<MultiKeywordSelector>());
614  new (SI) MultiKeywordSelector(nKeys, IIV);
615  SelTabImpl.Table.InsertNode(SI, InsertPos);
616  return Selector(SI);
617}
618
619SelectorTable::SelectorTable() {
620  Impl = new SelectorTableImpl();
621}
622
623SelectorTable::~SelectorTable() {
624  delete &getSelectorTableImpl(Impl);
625}
626
627const char *clang::getOperatorSpelling(OverloadedOperatorKind Operator) {
628  switch (Operator) {
629  case OO_None:
630  case NUM_OVERLOADED_OPERATORS:
631    return nullptr;
632
633#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
634  case OO_##Name: return Spelling;
635#include "clang/Basic/OperatorKinds.def"
636  }
637
638  llvm_unreachable("Invalid OverloadedOperatorKind!");
639}
640